int MPI_Finalize( void );

Remarks

This routines cleans up all MPI state. Once this routine is called, no MPI routine (even MPI_INIT) may be called. The user must ensure that all pending communications involving a process completes before the process calls MPI_FINALIZE.

Thread and Signal Safety

Notes for Fortran

All MPI objects (e.g., MPI_Datatype, MPI_Comm) are of type INTEGER in Fortran.

Errors

All MPI routines (except MPI_Wtime and MPI_Wtick) return an error value; C routines as the value of the function and Fortran routines in the last argument. Before the value is returned, the current MPI error handler is called. By default, this error handler aborts the MPI job. The error handler may be changed with MPI_Comm_set_errhandler (for communicators), MPI_File_set_errhandler (for files), and MPI_Win_set_errhandler (for RMA windows). The MPI-1 routine MPI_Errhandler_set may be used but its use is deprecated. The predefined error handler MPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not guarentee that an MPI program can continue past an error; however, MPI implementations will attempt to continue whenever possible.

MPI_SUCCESS

No error; MPI routine completed successfully.

Example Code

The following sample code illustrates MPI_Finalize.

#include "mpi.h"
#include <stdio.h>
int main(int argc, char *argv[])
{
    int rank, nprocs;

    MPI_Init(&argc,&argv);
    MPI_Comm_size(MPI_COMM_WORLD,&nprocs);
    MPI_Comm_rank(MPI_COMM_WORLD,&rank);
    printf("Hello, world.  I am %d of %d\n", rank, nprocs);fflush(stdout);
    MPI_Finalize();
    return 0;
}